Just a quick note:
If you really want to delve into software development or even game development, then the best resources are found in English. I myself am from Germany and a software developer (game stuff is just a hobby) and when I compare the resources on the internet, most good informations are found in English (
stackoverflow.com for example is THE site on the internet, where you can find quick help. They have a lot of sub pages for specific topics, like
Game Development).
The books from Packt are available in print and PDF format. Sometimes both is cheaper then just digital
![Shocked :o](https://www.sfml-dev.org/forums/Smileys/default/shocked.gif)
But make sure to work through the SFML tutorial on this site
![Smiley :)](https://www.sfml-dev.org/forums/Smileys/default/smiley.gif)
Anyway, good luck!